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B5. LED blinks seven times, then repeats (IPM Fault: A & E Inverters)
Protection Logic
Blink BlinkBlink Blink Blink Blink Blink OFF
Protection
logic
Check B
Blink 7 times
(Lock Piston Trip) Check B5
Compressor
Doesn’t work
Y
N
Repeat
Check Procedure
Replace
Drive PCB
N
Y
Check IPM
visual inspection
(turn off)
Short
Test
Point A
Power
Reset
Compressor
Damage
Check C3
Replace
Compressor
NG
Y
Modify
- Purpose: Prevent high current due to IPM Short
- Cause: Damaged IPM (Dead Short)
- Test for a dead short at Point A with a VOM.
- Logic: Compressor is forced off and tries to restart in 20 minutes.
A
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